US11063869B2 - ARP table management system - Google Patents
ARP table management system Download PDFInfo
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- US11063869B2 US11063869B2 US16/666,127 US201916666127A US11063869B2 US 11063869 B2 US11063869 B2 US 11063869B2 US 201916666127 A US201916666127 A US 201916666127A US 11063869 B2 US11063869 B2 US 11063869B2
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- arp
- address
- next hop
- destination address
- entry
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
- H04L45/745—Address table lookup; Address filtering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/10—Mapping addresses of different types
- H04L61/103—Mapping addresses of different types across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/58—Caching of addresses or names
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2101/00—Indexing scheme associated with group H04L61/00
- H04L2101/60—Types of network addresses
- H04L2101/618—Details of network addresses
- H04L2101/622—Layer-2 addresses, e.g. medium access control [MAC] addresses
Definitions
- the present disclosure relates generally to information handling systems, and more particularly to managing Address Resolution Protocol (ARP) tables utilized by information handling systems.
- ARP Address Resolution Protocol
- An information handling system generally processes, compiles, stores, and/or communicates information or data for business, personal, or other purposes thereby allowing users to take advantage of the value of the information.
- information handling systems may also vary regarding what information is handled, how the information is handled, how much information is processed, stored, or communicated, and how quickly and efficiently the information may be processed, stored, or communicated.
- the variations in information handling systems allow for information handling systems to be general or configured for a specific user or specific use such as financial transaction processing, airline reservations, enterprise data storage, or global communications.
- information handling systems may include a variety of hardware and software components that may be configured to process, store, and communicate information and may include one or more computer systems, data storage systems, and networking systems.
- ARP Address Resolution Protocol
- link layer addresses e.g., Media Access Control (MAC) addresses
- IPv4 Internet Protocol version 4
- the ARP tables discussed above may include an ARP entry table (e.g., an “L3_ENTRY_IPV4_UNICAST” table) that is configured to store destination internet layer addresses (e.g., IPv4 addresses identified in received data packets) in association with next hop index values, and an ARP egress table (e.g., an “EGR_L3_NEXT_HOP” table) that is configured to store next hop link layer addresses (e.g., MAC addresses obtained via ARP operations) in association with next hop index values.
- ARP entry table e.g., an “L3_ENTRY_IPV4_UNICAST” table
- destination internet layer addresses e.g., IPv4 addresses identified in received data packets
- ARP egress table e.g., an “EGR_L3_NEXT_HOP” table
- next hop link layer addresses e.g., MAC addresses obtained via ARP operations
- the ARP egress table is typically smaller in size than the ARP entry table, and thus will fill up prior to the ARP entry table.
- subsequent internet layer addresses received in data packets and their associated link layer addresses obtained via ARP operations are stored in the ARP entry table as “double entries” that utilize two entry rows in the ARP entry table (e.g., a first ARP entry row in the ARP entry table that identifies the internet layer address, and a second ARP entry row in the ARP entry table that identifies the link layer address.)
- conventional ARP table management systems will provide each of those internet layer address/link layer address mappings with respective double entries in the ARP entry table. As discussed in further detail below, such conventional ARP table management systems do not provide for the most efficient utilization of the ARP tables in such situations.
- an Information Handling System includes a processing system; and a memory system that is coupled to the processing system and that includes instructions that, when executed by the processing system, cause the processing system to provide an Address Resolution Protocol (ARP) table management engine that is configured to: map destination addresses to next hop addresses using an ARP entry table and an ARP egress table; determine that the ARP egress table is full and, in response, map destination addresses to next hop addresses in double-entries in the ARP entry table; and determine, when the ARP egress table is full, that a second destination address is associated with a first next hop address that is mapped to a first destination address in a first double-entry in the ARP entry table and, in response: identify a third destination address in the ARP entry table that is the only destination address in the ARP entry table that is mapped to a second next hop address in the ARP egress table; remove the second next hop address from an ARP egress row in the ARP egress table and map the third destination address to
- ARP Address Resolution Protocol
- FIG. 1 is a schematic view illustrating an embodiment of an Information Handling System (IHS).
- IHS Information Handling System
- FIG. 3 is a schematic view illustrating an embodiment of a networking device that may be provided in the ARP table management system of FIG. 2 .
- FIG. 5 is a flow chart illustrating an embodiment of a method for managing ARP tables.
- FIG. 6A is a schematic view illustrating an embodiment of the ARP table database during the method of FIG. 5 .
- FIG. 6B is a schematic view illustrating an embodiment of the ARP table database during the method of FIG. 5 .
- FIG. 6C is a schematic view illustrating an embodiment of the ARP table database during the method of FIG. 5 .
- IHS 100 further includes a display 110 , which is coupled to processor 102 by a video controller 112 .
- a system memory 114 is coupled to processor 102 to provide the processor with fast storage to facilitate execution of computer programs by processor 102 .
- Examples of system memory may include random access memory (RAM) devices such as dynamic RAM (DRAM), synchronous DRAM (SDRAM), solid state memory devices, and/or a variety of other memory devices known in the art.
- RAM random access memory
- DRAM dynamic RAM
- SDRAM synchronous DRAM
- solid state memory devices solid state memory devices
- a chassis 116 houses some or all of the components of IHS 100 . It should be understood that other buses and intermediate circuits can be deployed between the components described above and processor 102 to facilitate interconnection between the components and the processor 102 .
- the ARP table management system 200 includes one or more source devices 202 .
- the source device(s) 202 may be provided by the IHS 100 discussed above with reference to FIG. 1 , and/or may include some or all of the components of the IHS 100 , and in specific examples may be provided by server devices, desktop computing devices, laptop/notebook computing devices, tablet computing devices, mobile phones, and/or other computing devices that would be apparent to one of skill in the art in possession of the present disclosure.
- server devices desktop computing devices, laptop/notebook computing devices, tablet computing devices, mobile phones, and/or other computing devices that would be apparent to one of skill in the art in possession of the present disclosure.
- source devices provided in the ARP table management system 200 may include any devices that may be configured to operate similarly as the source device(s) 202 discussed below.
- the ARP table management system 200 also includes a networking device 204 that is coupled to the source device(s) 202 .
- the networking device 204 may be provided by the IHS 100 discussed above with reference to FIG. 1 , and/or may include some or all of the components of the IHS 100 , and in specific examples is provided by a switch device that performs the ARP table management operations discussed below.
- networking devices provided in the ARP table management system 200 may include any devices that may be configured to operate similarly as the networking device 204 discussed below.
- the ARP table management system 200 also includes a plurality of networking devices 206 , 208 , 210 , and up to 212 that are each coupled to the networking device 204 .
- Any or all of the networking devices 206 - 212 may be provided by the IHS 100 discussed above with reference to FIG. 1 , and/or may include some or all of the components of the IHS 100 , and in specific examples are provided by “next-hop” switch devices that provide a “next hop” from the networking device 204 to their connected destination devices.
- networking devices provided in the ARP table management system 200 may include any devices that may be configured to operate similarly as the networking devices 206 - 212 discussed herein. While the networking devices 206 - 212 are described as the “next hops” for the networking device 204 to destination devices, one of skill in the art in possession of the present disclosure will appreciate that other networking devices in the ARP table management system 200 may operate similarly while remaining within the scope of the present disclosure as well.
- destination devices provided in the ARP table management system 200 may include any devices that may be configured to operate similarly as the destination devices 214 - 224 discussed herein. While the destination devices 214 - 224 are illustrated as each directly coupled to one of the networking devices 206 - 212 , one of skill in the art in possession of the present disclosure will recognize that intermediate devices (e.g., other networking devices) may be coupled between the networking devices 206 - 212 and the destination devices 214 - 224 while remaining within the scope of the present disclosure as well.
- intermediate devices e.g., other networking devices
- next hop index values in the next hop index columns 402 b and 404 a may be utilized to provide mappings between destination IP addresses in the destination IP address column 402 a with next hop MAC addresses in the next hop MAC address column 404 b .
- ARP tables mapping specific destination addresses and next hop addresses have been described, one of skill in the art in possession of the present disclosure will recognize that the teachings of the present disclosure may be applied to other destination addresses and next hop addresses while remaining within the scope of the present disclosure as well.
- the ARP table management engine 304 in the networking device 204 / 300 has mapped the IPv4 address (“10.1.1.1”) to the MAC address (e.g., “00:01:00:00:00:00”) in the ARP entry table 402 and ARP egress table 404 by providing a row/entry 600 a in the ARP entry table 402 that includes the IPv4 address (“10.1.1.1”) in the destination IP address column 402 a and a next hop index value (“1”) in the next hop index column 402 b , and providing a row/entry 600 b in the ARP egress table 404 that includes the next hop index value (“1”) in the next hop index column 404 a and the MAC address (e.g., “00:01:00:00:00:00”) in the next hop MAC address column 404 b , with the next hop index value (“1”) mapping the IPv4 address (“10.1.1.1”) to the MAC address (e.g., “00:01:00:00:00:00”).
- the ARP table management engine 304 in the networking device 204 / 300 may have received a data packet generated by a source device 202 and destined for the destination device 218 , and identified an IPv4 address (“10.1.1.2”) of the destination device 218 in that data packet.
- the ARP table management engine 304 in the networking device 204 / 300 may have then performed ARP operations to identify a MAC address (e.g., “00:02:00:00:00:00”) of the networking device 210 that provides the next hop to the destination device 218 from the networking device 204 .
- ARP operations to identify next hop addresses (e.g., MAC addresses) of next hop devices are known in the art and thus not discusses herein in detail. Thus, as illustrated in FIG.
- the ARP table management engine 304 in the networking device 204 / 300 may have received data packets generated by a source device 202 and destined for the respective destination devices 214 and 216 , and identified respective IPv4 addresses (“10.1.1.3” and “10.1.1.4”) of the respective destination devices 214 and 216 in those data packets.
- the ARP table management engine 304 in the networking device 204 / 300 may have then performed ARP operations to identify a MAC address (e.g., “00:03:00:00:00:00”) of the networking device 206 that provides the next hop to the destination devices 214 and 216 from the networking device 204 .
- next hop addresses e.g., MAC addresses
- the ARP table management engine 304 in the networking device 204 / 300 has mapped the IPv4 addresses (“10.1.1.3” and “10.1.1.4”) to the MAC address (e.g., “00:03:00:00:00:00”) in the ARP entry table 402 and ARP egress table 404 by providing a row/entry 604 a in the ARP entry table 402 that includes the IPv4 address (“10.1.1.3”) in the destination IP address column 402 a and a next hop index value (“3”) in the next hop index column 402 b , providing a row/entry 604 b in the ARP entry table 402 that includes the IPv4 address (“10.1.1.4”) in the destination IP address column 402 a and the next hop index value (“3”) in the next hop index column 402 b , and providing a row/entry 604 b in the ARP entry table 402 that includes the IPv4 address (“10.1.1.4”) in the destination IP address column 40
- the method 500 then proceeds to decision block 504 where it is determined whether the ARP egress table is full.
- the ARP table management engine 304 in the networking device 204 / 300 may operate to determine whether the ARP egress table 404 has filled up.
- the ARP egress table 404 is discussed as capable of storing 50,000 rows/entries, while the ARP entry table 402 is discussed as capable of storing 150,000 rows/entries, although one of skill in the art in possession of the present disclosure will recognize that a variety of different sized ARP entry tables and ARP egress tables will fall within the scope of the present disclosure as well.
- the ARP table management engine 304 in the networking device 204 / 300 may determine whether all of the available rows/entries in the ARP egress table 404 have been utilized to store next hop value/next hop MAC address pairs.
- the method 500 proceeds to block 506 where the networking device maps destination addresses to next hop addresses in double-entries in the ARP entry table.
- the source device(s) 202 may generate and transmit data packets to the destination devices 214 - 224 via the networking device 204 and, as such, the ARP table management engine 304 in the networking device 204 / 300 may receive data packets generated and transmitted by the source device(s) 202 via its communication system 308 at block 506 , identify destination addresses in those data packets, identify next hop addresses for those data packets, and map the destination addresses to the next hop addresses in double-entries in the ARP entry table 402 .
- the ARP table database 400 is illustrated with double-entries in the ARP entry table 402 following the receiving of data packets from the source device(s) 202 by the networking
- the ARP table management engine 304 in the networking device 204 / 300 has mapped the IPv4 address (“192.1.1.1”) to the MAC address (e.g., “00:AA:00:00:00:00”) in a double-entry 606 in the ARP entry table 402 by providing a row/entry 606 a in the ARP entry table 402 that includes the IPv4 address (“192.1.1.1”) in the destination IP address column 402 a and no value (e.g., “N/A”) the next hop index column 402 b , and providing a row/entry 606 b in the ARP entry table 402 that includes the MAC address (e.g., “00:AA:00:00:00:00”) in the destination IP address column 402 a and no value (e.g., “N/A”) the next hop index column 402 b.
- the ARP table management engine 304 in the networking device 204 / 300 may operate during the performance of the double-entry mapping in the ARP entry table 402 to determine whether a destination address received in a data packet is to-be mapped to a next hop address that is already mapped to another destination address in a double-entry provided in the ARP entry table 402 .
- the ARP table management engine 304 in the networking device 204 / 300 may periodically analyze the ARP entry table 402 to determine whether double-entry mapping operations have resulted in at least two double-entries that map respective destination addresses to the same next hop address.
Abstract
Description
[ARP egress table size]+([ARP entry table size]−[ARP egress table size])/2
Thus, using an example in which the ARP entry table 402 is capable of storing 150,000 rows/entries and the ARP egress table 404 is capable of storing 50,000 rows/entries, the maximum number of destination address/next hop address mappings available in such a system would be:
50,000+(150,000−50,000)/2=100,000
As discussed below, the
([ARP egress table size]+X)+([ARP entry table size]−([ARP egress table size]+X))/2
(50,000+50,000)+(150,000−(50,000+50,000))/2=125,000
As such, in some embodiments, up to a 25% increase in destination/next hop mappings may be realized.
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US20190297050A1 (en) * | 2018-03-21 | 2019-09-26 | Huawei Technologies Co., Ltd. | Method and system for network access discovery |
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US10805202B1 (en) * | 2019-01-25 | 2020-10-13 | Juniper Networks, Inc. | Control plane compression of next hop information |
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US20140269729A1 (en) * | 2011-11-29 | 2014-09-18 | Huawei Technologies Co., Ltd. | Packet forwarding method, apparatus, and system |
US20150312137A1 (en) * | 2013-03-28 | 2015-10-29 | International Business Machines Corporation | Transferring data in a gateway |
US20190297050A1 (en) * | 2018-03-21 | 2019-09-26 | Huawei Technologies Co., Ltd. | Method and system for network access discovery |
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